1 files changed, 70 insertions, 0 deletions
diff --git a/src/main/java/com/beust/jcommander/defaultprovider/PropertyFileDefaultProvider.java b/src/main/java/com/beust/jcommander/defaultprovider/PropertyFileDefaultProvider.java
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+++ b/src/main/java/com/beust/jcommander/defaultprovider/PropertyFileDefaultProvider.java
@@ -0,0 +1,70 @@
+/**
+ * Copyright (C) 2010 the original author or authors.
+ * See the notice.md file distributed with this work for additional
+ * information regarding copyright ownership.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.beust.jcommander.defaultprovider;
+
+import com.beust.jcommander.IDefaultProvider;
+import com.beust.jcommander.ParameterException;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.Properties;
+
+/**
+ * A default provider that reads its default values from a property file.
+ * 
+ * @author cbeust
+ */
+public class PropertyFileDefaultProvider implements IDefaultProvider {
+  public static final String DEFAULT_FILE_NAME = "jcommander.properties";
+  private Properties m_properties;
+
+  public PropertyFileDefaultProvider() {
+    init(DEFAULT_FILE_NAME);
+  }
+
+  public PropertyFileDefaultProvider(String fileName) {
+    init(fileName);
+  }
+
+  private void init(String fileName) {
+    try {
+      m_properties = new Properties();
+      URL url = ClassLoader.getSystemResource(fileName);
+      if (url != null) {
+        m_properties.load(url.openStream());
+      } else {
+        throw new ParameterException("Could not find property file: " + fileName
+            + " on the class path");
+      }
+    }
+    catch (IOException e) {
+      throw new ParameterException("Could not open property file: " + fileName);
+    }
+  }
+  
+  public String getDefaultValueFor(String optionName) {
+    int index = 0;
+    while (index < optionName.length() && ! Character.isLetterOrDigit(optionName.charAt(index))) {
+      index++;
+    }
+    String key = optionName.substring(index);
+    return m_properties.getProperty(key);
+  }
+
+}